Fix clone problem

judge/models/problem.py

@@ -556,10 +556,10 @@ class Problem(models.Model, PageVotable, Bookmarkable):
         cache.set(key, result)
         return result
 
-    def save(self, *args, **kwargs):
+    def save(self, should_move_data=True, *args, **kwargs):
         code_changed = self.__original_code and self.code != self.__original_code
         super(Problem, self).save(*args, **kwargs)
-        if code_changed:
+        if code_changed and should_move_data:
             if hasattr(self, "data_files") or self.pdf_description:
                 try:
                     problem_data_storage.rename(self.__original_code, self.code)

judge/views/problem.py

@@ -1186,7 +1186,7 @@ class ProblemClone(
         problem.ac_rate = 0
         problem.user_count = 0
         problem.code = form.cleaned_data["code"]
-        problem.save()
+        problem.save(should_move_data=False)
         problem.authors.add(self.request.profile)
         problem.allowed_languages.set(languages)
         problem.language_limits.set(language_limits)